首页|Selective recovery of Th(Ⅳ)from radioactive rare earth waste residue by utilizing MoS2-modified ion-absorbed type rare earth tailings

Selective recovery of Th(Ⅳ)from radioactive rare earth waste residue by utilizing MoS2-modified ion-absorbed type rare earth tailings

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In the process of extracting ion-absorbed rare earth ore(IREO),the production of radioactive waste is a major environmental concern.To address this issue,MoS2 was used to modify ion-absorbed rare earth tailings(RET)to synthesize a novel MoS2@RET composite material for the effective handling of radio-active waste generated in IREO separation industry.The composite material was thoroughly character-ized using various analytical techniques,including X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),thermogravimetry(TG),Fourier-transform infrared(FTIR),scanning electron mi-croscopy(SEM),Brunauer-Emmett-Teller(BET)and energy dispersive spectroscopy(EDS).By optimizing the operating parameters,the optimal experimental conditions were determined to be pH=3,contact time=60 min,liquid-solid ratio=6 g/L,and initial concentration=150 mg/L The adsorption data fitted well with the pseudo second-order rate model.The thermodynamic parameters concerning the adsorption of Th(Ⅳ)were analyzed and computed.Langmuir isotherm model is a more fitting choice for the adsorption process compared to the Freundlich isotherm model.MoS2@RET was used in the acid leachate of IREO waste residue,achieving the separation of Th and rare earth successfully.The mecha-nism of Th(Ⅳ)adsorption by MoS2@RET was investigated,revealing that the adsorption process involves electrostatic interactions,chemical bonding,and redox reactions.The above research results indicate that MoS2@RET composite materials have application potential in the sustainable treatment of IREO radio-active waste.

Rare earthsThoriumRadioactive waste residueAdsorptionSeparation

Xirong Chen、Xinyu Fu、Yun Gao、Zhiyuan Zeng、Bin Huang、Xiaoqi Sun

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Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou,341000,China

CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,350002,China

Fujian Research Center for Rare Earth Engineering Technology,Xiamen Institute of Rare Earth Materials,Haixi Institute,Chinese Academy of Sciences,Xiamen,361021,China

Fujian College,Unive

Fujian College,University of Chinese Academy of Sciences,Fuzhou,350002,China

Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou

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National Key R&D Program of ChinaKey R&D Program of Jiangxi ProvinceFujian Program for High-Level Entrepreneurial and Innovative Talents Introduction

2017YFE010690020203BBG72W013

2024

10.1016/j.jre.2023.09.015

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(9)
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